I did mine similar to big sky, I removed them, and used a combination Dremel tool and utility knife. I used the knife in the very edges, seemed to be a cleaner cut, and didn't melt the plastic. I used the dremel for the middle. I have noticed vast improvements in the air flow, I'm about to head out to Darien Lake, there till Sunday, so ill know more after I am using the unit for a few days. Big difference in air flow already though....
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Ed
2016 Montana 3950 BR
2004 Montana 3650 RK
2019 Ram 3500 SRW Laramie CTD 6.7
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